Class 9 – Monday, September 16

Lest we go forward — Without knowing about lists — We would be wanting

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Look both ways

• Back or ahead

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Agenda

• Introduce randomness

• Introduce for loop

• Introduce lists

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Downloads

• Program love_is_all_you_need.py

• Program amore.py

• Program ready_or_not.py

• Program again_and_again.py

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• Program kinda_stringy.py

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To do list

• Homework

• Review class artifacts.

• Read the epistle on lists.

• Check out my documentation for the random module.

• Check out my documentation for the list module.

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Example to motivate looping

• Program love_is_all_you_need.py

• Let's print out one-line-at-a-time, a bunch of the phrase Love is all you need

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Examples to introduce looping

• Program amore.py

• Prints out a user-supplied string list of words, one by one

Some program runs

Enter three words: am or e

am

or

e

Enter a list of words: amor mapenzi amour liebe rakkaus

amor

mapenzi

amour

liebe

rakkaus

Enter three words: abcd efg hijklm

abcd

efg

hijklm

Enter a list of words: ljubav aroha ghaoil uthando

ljubav

aroha

ghaoil

uthando

• Program ready_or_not.py

• Prints out the integers 0 to n-1 for user-supplied n; afterwards, prints out the phrase 'Ready or not here I come!'

• Some program runs

Enter a number: 10

0 Mississippi

1 Mississippi

2 Mississippi

3 Mississippi

4 Mississippi

5 Mississippi

6 Mississippi

7 Mississippi

8 Mississippi

9 Mississippi

Ready or not here I come!

Enter a number: 15

0 Mississippi

1 Mississippi

2 Mississippi

3 Mississippi

4 Mississippi

5 Mississippi

6 Mississippi

7 Mississippi

8 Mississippi

9 Mississippi

10 Mississippi

11 Mississippi

12 Mississippi

13 Mississippi

14 Mississippi

Ready or not here I come!

• Program again_and_again.py

• Prints a requested phrase a requested number of times

• Some program runs

Enter string to be printed: one more time

Enter number of times to be printed: 5

one more time

one more time

one more time

one more time

one more time

Enter string to be printed: I said how are you today

Enter number of times to be printed: 10

I said how are you today

I said how are you today

I said how are you today

I said how are you today

I said how are you today

I said how are you today

I said how are you today

I said how are you today

I said how are you today

I said how are you today

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Going through a string

• Program kinda_stringy.py

• Prints out the characters of two user-supplied strings, character by character. The first without a loop, the second with a loop.

Enter a three-letter string: abc

a

b

c

Enter a string: four score and seven

f

o

u

r

s

c

o

r

e

a

n

d

s

e

v

e

n

Enter a three-letter string: def

d

e

f

Enter a string: years ago our

y

e

a

r

s

a

g

o

o

u

r

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Counting sheep

 

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© 2019 Jim Cohoon

Resources from previous semesters are available.